CN109175905B - Single-side clamping hole making method for double-side stepped hole part - Google Patents
Single-side clamping hole making method for double-side stepped hole part Download PDFInfo
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- CN109175905B CN109175905B CN201811154165.9A CN201811154165A CN109175905B CN 109175905 B CN109175905 B CN 109175905B CN 201811154165 A CN201811154165 A CN 201811154165A CN 109175905 B CN109175905 B CN 109175905B
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a single-side clamping hole making method for a double-side stepped hole part, which belongs to the technical field of hole machining and mainly comprises the following steps: step S3: respectively finely boring an upper counter bore and a stepped bore, and after a boring cutter is installed, determining that the machine tool bores when the SPOS =0The direction of the tool tip of the tool bit is taken as the positive direction of the X axis; then, a boring cutter is inserted into the hole downwards along the Y axis for boring, the machine tool stops rotating after boring the hole, and the cutter point of the boring cutter is ensured to still point to the positive direction of the X axis; then the boring cutter retreats along the negative direction of the X axis by L1=0.1mm, and then exits upward along the Y axis; step S4: reversely boring the lower counter bore; further comprising step S1: roughly milling a counter bore, a step hole and a down-sinking hole; step S2: and (5) milling the lower counter bore. The invention adopts a fixed boring mode to bore the upper counter bore in place; boring the step hole in place by adopting a fixed boring mode; the size of the lower hole is bored in place by adopting the fixed boring and reverse boring modes, the times of clamping and reference conversion are reduced, the precision of the hole to be machined, such as surface roughness, coaxiality and the like, is ensured, and the hole machining efficiency is improved.
Description
Technical Field
The invention relates to the technical field of hole machining, in particular to a single-side clamping hole-making method for a double-side step hole part.
Background
With the development of aviation technology, performance indexes such as maneuvering performance, flight performance, service life and low manufacturing cost of modern airplanes are continuously improved, aviation structural members are gradually developed in the directions of large-scale, integration, thin-wall, complication and the like, the assembly precision requirement is greatly improved, and the aviation structural members are particularly reflected on precision holes with high size precision and high position precision requirements. The double-side stepped holes generally exist in aviation integral frame beam and joint structural members, are mainly used for assembling core components such as high-precision transmission shafts, heavy-duty bearings and bushings, have a structure of double-side counter bores and stepped through holes, are high-precision holes, have high requirements on roundness, coaxiality and surface roughness, and have a typical structure shown in figure 1.
Because the precision requirement of the holes to be processed of the two-side step holes is high, and the counter bores generally have bottom corner parts of R0.2-R0.8, the counter bores are generally processed in place in a boring manner, the counter bores and the step holes on one side are generally processed firstly, and the counter bores on the other side are processed in a turned-over manner in the conventional two-side step hole processing method, the processing method has the following problems:
(1) hole coaxiality cannot be guaranteed: the scheme of boring counter bores on two sides and processing the step holes on two sides in place is adopted, the step holes on two sides are formed in a processing mode under two clamping states, and due to errors caused by clamping, alignment and part deformation, coaxiality of the holes at the positions 3 cannot be guaranteed, so that assembly accuracy is affected.
(2) The processing efficiency is low: the existing boring process mostly adopts a low-speed boring in-boring out mode, and the track is shown as the attached figure 2. The boring mode has the advantages of low tool retracting speed and low machining efficiency, and secondary cutting exists, so that machining scratches are easily generated on the hole wall; due to the fact that holes are formed in the two sides, the hole forming process is executed in two times, machining procedures are complex, the preparation times of the cutter are increased, and machining efficiency of the whole part is reduced.
Since the double-sided stepped bore structure has 3 typical structures: the upper counter bore, the step bore and the lower counter bore are machined in a double-sided mode at present, rough hole milling is also executed in two sides, and the machining process flow is complicated. Due to the problems that coaxiality cannot be guaranteed, machining efficiency is low and the like, the existing double-side step hole machining process scheme cannot meet the current machining requirement, and an efficient and high-quality process method is urgently needed to improve the machining stability of the double-side step holes, so that high-performance machining of the structure is guaranteed.
Disclosure of Invention
The invention aims to solve the technical problems and provides a single-side clamping hole-making method for a double-side step hole part, which is characterized in that a fixed boring mode is adopted to bore a counter bore in place; boring the step hole in place by adopting a fixed boring mode; the method has the advantages that the size of the lower hole is bored in place by adopting the fixed boring and reverse boring modes, the times of clamping and reference conversion are reduced, the precision of the hole to be machined, such as surface roughness, coaxiality and the like, is ensured, and the hole machining efficiency is improved.
The invention is realized by the following technical scheme:
a single-side clamping hole making method for a double-side step hole part mainly comprises the following steps:
step S3: respectively finely boring the upper counter bore and the step bore, determining the direction of a tool tip of a tool bit of the boring tool when the SPOS =0 after the boring tool is installed, and taking the direction of the tool tip as the positive direction of an X axis; then, a boring cutter is inserted into the hole downwards along the Y axis for boring, the machine tool stops rotating after boring the hole, and the cutter point of the boring cutter is ensured to still point to the positive direction of the X axis; then the boring cutter retreats along the negative direction of the X axis by L1=0.1mm, and then exits upward along the Y axis;
step S4: reversely boring the lower counter bore, and boring the lower counter bore by using a reverse boring cutter; after the boring cutter is installed, determining the direction of a cutter point of a tool bit of the reverse boring cutter when the SPOS =0, and taking the direction of the cutter point as the positive direction of an X axis; the main shaft stops rotating, and the reverse boring cutter moves L along the negative direction of the X axis at the position of the hole axis3The distance is measured, then the boring cutter rapidly extends into the hole downwards along the Y-axis direction, and the cutter point of the reverse boring cutter is ensured to completely extend out of the lower end face of the sinking hole; the main shaft continues to stop rotating, and the reverse boring cutter moves L along the positive direction of the X axis3The distance is equal to the distance, the main shaft is reversed, the reverse boring cutter moves upwards to the upper end of the sinking hole along the Y axis at the boring speed, and after boring the hole, the reverse boring cutter moves downwards to the lower end face of the sinking hole along the Y axis at the boring speed to withdraw the part; the main shaft stops rotating to ensure that the tool nose of the reverse boring cutter points to the positive direction of the X axis and then moves in the reverse direction of the X axis by L3Distance, exit upwards along the Y-axis direction.
In order to better implement the invention, further, the L3=(D4-D3) 0.2 to 0.5, wherein D3Is the diameter of the stepped hole; d4Is the diameter of the lower counterbore.
In order to better implement the invention, in step S3, the upper counter bore and the step bore are bored by using a digital display boring cutter and a fixed boring method, and the width of each bored hole is cuta e ≤0.2mm。
In order to better implement the invention, in step S4, a digital display boring cutter with a reverse boring function is used, and a fixed boring and reverse boring method is used to bore the sinking hole, and each bore is cut to be widea e ≤0.2mm。
In order to better realize the invention, the tool bit of the reverse boring and boring tool is further reversedThe distance L from the tool nose to the near end of the tool bar of the reverse boring tool is arranged4>（D4-D3) And/2, and the distance L from the knife tip to the distal end side of the knife bar5<D3-1.1。
In order to better implement the invention, the method further comprises the following steps:
step S1: respectively and roughly milling an upper counter bore, a step hole and a lower counter bore by adopting an end mill, wherein the diameters of the step hole and the lower counter bore are the same, and roughly milling to obtain the allowance delta on the side surface of the upper counter bore1=0.5mm, and the margin Δ of the side surface of the stepped hole2=0.5mm, and the process margin of the lower counter bore is delta3=(D4-D3) 2+0.5, wherein 2D1＜D3，D1Is the diameter of the end mill;
step S2: adopting a T-shaped cutter to mill the lower counter bore in a repairing way, wherein the diameter of the cutting edge of the T-shaped cutter is D5The diameter of the cutter bar is D6And D is5＜D3，(D5-D6)/2＞(D4-D3) 2; and d, the allowance delta of the side surface of the lower counter bore after the milling4And the bottom surface is not left with a margin of 0.5 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts a fixed boring mode to bore the upper counter bore in place; boring the step hole in place by adopting a fixed boring mode; the method has the advantages that the size of the lower hole is bored in place by adopting the fixed boring and reverse boring modes, the times of clamping and reference conversion are reduced, the precision of the hole to be machined, such as surface roughness, coaxiality and the like, is ensured, and the hole machining efficiency is improved. According to the invention, the upper counter bore, the step bore and the lower counter bore are respectively processed on one side, so that the hole coaxiality is improved, and the error is reduced, thereby improving the assembly precision, reducing the processing flow and facilitating the processing.
(2) By adopting the fixed boring processing mode, the invention not only reduces the boring tool retracting time, but also avoids the secondary cutting during boring; through the reverse boring machining mode combined with the fixed boring, the machining steps are reduced, the machining is more convenient, and the machining efficiency and quality are improved.
(3) According to the invention, the process allowance is reserved in rough milling and finish milling respectively, and the size of the cutter is matched with the hole machining size, so that the machining precision and the hole coaxiality are improved, the error is reduced, and the machining efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of a double-sided stepped bore of the present invention;
FIG. 2 is a schematic diagram of a common boring feed trajectory of the present invention;
FIG. 3 is a diagram of a rough hole milling feed trajectory according to the present invention;
FIG. 4 is a schematic view of the boring allowance of the present invention;
FIG. 5 is a schematic diagram of a T-shaped cutter and a rough milling down-hole feed track according to the present invention;
FIG. 6 is a schematic view of the sinking hole boring allowance of the present invention;
FIG. 7 is a schematic diagram of a feed trajectory of a forward boring stepped bore of the present invention;
FIG. 8 is a schematic view of the reverse boring cutter head of the present invention;
fig. 9 is a schematic diagram of a reverse boring down-hole feed trajectory of the present invention.
Wherein: 1-step holes on two sides; 2, boring, feeding and discharging tracks; 3-mounting a counter bore; 4-a stepped bore; 5-lower counter bore; 6, roughly milling a hole track; 7-boring the counter bore for allowance; 8-step hole boring allowance; 9-sinking hole step allowance; a 10-T-shaped knife; 11-milling a feed track of the sinking hole; 12-sinking hole side allowance; 13-boring a step hole feed track in a fixed mode; 14-a boring cutter; 15-boring cutter head; 16-reverse boring cutter head; 17-center of spindle rotation; and 18-reverse boring the lower hole feed path.
Detailed Description
As shown in fig. 1, a single-side clamping hole making method for a double-side stepped hole part mainly comprises the following steps:
step S3: respectively finely boring the upper counter bore 3 and the stepped bore 4, and after installing the boring cutter 14, determining the direction of a cutter point of a cutter head 15 of the boring cutter when the SPOS =0, and taking the direction of the cutter point as the positive direction of an X axis; then, the boring cutter 14 is inserted into the hole downwards along the Y axis for boring, after boring, the machine tool stops rotating and the cutter point of the boring cutter 14 is ensured to still point to the positive direction of the X axis; then the boring cutter 14 retreats along the X-axis negative direction by L1=0.1mm，Then, the steel wire is withdrawn upwards along the Y axis;
the step holes 1 on the two sides are provided with an upper counter bore 3, a step hole 4 and a lower counter bore 5, the three holes are respectively roughly milled at the same side, and the conventional two-sided boring in-and-out cutter-moving track 2 shown in the figure 2 is simpler in process flow compared with the conventional machining process flow, and the machining efficiency is improved.
Because a common boring hole adopts a boring mode of a low-speed boring tool to carry out boring, the machining efficiency is low, and scratches are easily left on the surface of the hole, a boring mode of a high-quality and high-efficiency fixed cutter point direction and a fixed boring are adopted, a fixed boring step hole feed track 13 is shown in fig. 7, when a counter bore 3 and a step hole 4 are finely bored, a digital display boring tool is adopted to carry out boring in the fixed boring mode, firstly, after the boring tool is installed, the cutter point direction of a boring tool bit 15 of a machine tool is determined when SPOS =0, for example, the cutter point points point to the positive X direction, then, boring is carried out according to the track in the drawing, firstly, the boring tool feed track is along the central axis of the hole, after the hole is bored, the machine tool stops rotating, and at the moment, the cutter point direction of the boring tool is; then the boring cutter retreats to the X negative direction by L1And the mark is 0.1mm, and then the mark rapidly exits along the track from the point (c) to the point (c). The fixed boring mode reduces the boring tool retracting time, avoids secondary cutting during boring, and improves the machining efficiency and quality.
Step S4: reversely boring the lower counter bore 5, and boring the lower counter bore 5 by using a reverse boring cutter; after the boring cutter 14 is installed, determining the direction of the tool tip of the tool bit 15 of the reverse boring cutter when the SPOS =0, and taking the direction of the tool tip as the positive direction of the X axis; the main shaft stops rotating, and the reverse boring cutter moves L along the negative direction of the X axis at the position of the hole axis3The distance is measured, then the boring cutter rapidly extends into the hole downwards along the Y axis, and the cutter point of the reverse boring cutter is ensured to completely extend out of the lower end face of the lower counter bore 5; the main shaft continues to stop rotating, and the reverse boring cutter moves L along the positive direction of the X axis3The distance is equal to the distance, the main shaft is reversed, the reverse boring cutter moves upwards to the upper end of the sinking hole 5 along the Y axis at the boring speed, and after boring is finished, the reverse boring cutter moves downwards to the lower end face of the sinking hole 5 along the Y axis at the boring speed to withdraw the part; the main shaft stops rotating to ensure that the tool nose of the reverse boring cutter points to the positive direction of the X axis and then moves in the reverse direction of the X axis by L3Distance, exit upwards along the Y-axis direction.
Boring the sinking hole 5 by adopting a boring mode combining fixed boring and reverse boring, wherein the boring cutter has a reverse boring function, the reverse boring cutter is characterized in that a boring cutter head 15 is reversely mounted into a reverse boring cutter head 16, as shown in fig. 8, the size of the boring cutter meets the size required by boring, and the axis of the boring cutter passes through a main shaft rotation center 16; after the boring tool is mounted, the direction of the cutting edge of the boring tool bit 15 is determined when the machine tool has SPO =0, for example, the cutting edge points in the positive X direction, the spindle is stopped, and the boring tool is moved L in the negative X direction at the hole axial position3The tool bit reaches the fifth point, and then the tool bit is enabled to completely extend out of the lower end face of the lower counter bore 5 by fast feeding from the fifth point to the fifth point 0; the spindle stops rotating continuously, and the boring cutter moves from point (sixthly) to point (seventhly); the main shaft rotates reversely, the boring cutter moves from the point (c) to the point (b) at a boring speed, and after boring a hole, the boring cutter withdraws from the part at the boring speed and moves from the point (c) to the point (c); the main shaft stops rotating, the direction of the tool tip is checked at the moment and points to the positive direction X, then the boring tool sequentially moves from the point (c) to the point (c) and the point (c) 1, finally the reverse boring of the lower counter bore hole 5 is completed, and the tool feeding track 18 of the reverse boring lower counter bore hole is shown as the attached figure 9. Wherein L is2Distance of tool bit to end face of spindle, L4The distance between the point of the knife and the proximal side of the knife bar, L5The distance between the knife tip and the far end side of the knife bar.
Further, as a preference of various embodiments, the L3=(D4-D3) 0.2 to 0.5, wherein D3The diameter of the stepped hole 4; d4Is the diameter of the countersink 5.
Further, as a preference of different embodiments, in the step S3, the upper counter bore 3 and the step hole 4 are bored by using the digital display boring tool 14 and the fixed boring method, and the boring width is cut each timea e ≤0.2mm。
Further, as a preference of different embodiments, in the step S4, the digital display boring cutter 14 with the reverse boring function is adopted, and the sinking hole 5 is bored by the fixed boring and reverse boring method, and each boring is cut to be widea e ≤0.2mm。
When the lower counter bore 5 is finely bored, a digital display boring cutter with a reverse boring installation function is adopted to be installed for reverse boring, and the counter bore 5 is bored in a fixed boring manner.
Further, as a preference of different embodiments, the cutter head of the reverse boring cutter is reversely arranged, and the distance L from the cutter point to the proximal side of the cutter rod of the reverse boring cutter4>（D4-D3) And/2, and the distance L from the knife tip to the distal end side of the knife bar5<D3-1.1。
Further, as a preference of the different embodiment, step S1: respectively and roughly milling an upper counter bore 3, a step bore 4 and a lower counter bore 5 by using an end mill, wherein the step bore 4 and the lower counter bore 5 have the same diameter, and roughly milling to obtain the allowance delta on the side surface of the upper counter bore 31=0.5mm, and the margin Δ of the side surface of the stepped hole 42=0.5mm, process margin of sink 5 Δ3=(D4-D3) 2+0.5, wherein 2D1＜D3，D1Is the diameter of the end mill;
a rough milling hole track 6 is shown in fig. 3, after rough milling, an upper counter bore boring allowance 7, a step hole boring allowance 8 and a lower counter bore step allowance 9 are shown in fig. 4, process allowances of 0.5mm are reserved on the side surfaces of an upper counter bore 3 and a step hole 4, no allowances are reserved at the bottom of the upper counter bore 3, the diameters of the counter bores 3 on the diameter of the rough milling rear step hole 4 are the same, in the figure, delta 1 is the process allowances on the side surface of the upper counter bore, and delta 1 is the process allowances on the side surface2Is the process allowance of the side surface of the step hole, delta3The allowance 12 of the side surface of the sinking hole is shown in figure 6 as the technological allowance in the rough milling of the side surface of the sinking hole, and delta4The technological allowance for milling the side surface of the sinking hole, D2To go up the counter bore diameter, D3Is the diameter of the stepped hole, D4Is the diameter of the sinking hole.
Step S2: adopting a T-shaped cutter 10 to mill a sinking hole 5, wherein the diameter of the cutting edge of the T-shaped cutter 10 is D5The diameter of the cutter bar is D6And D is5＜D3，(D5-D6)/2＞(D4-D3) 2; the side allowance Delta of the lower counter bore 5 after the milling4And the bottom surface is not left with a margin of 0.5 mm.
As shown in FIG. 5, rough milling is carried out by using a T-shaped cutter 10 according to a milling completion sinking hole feed path 11, wherein D is6Is the shank diameter of the T-knife 10, D5The diameter of the cutting edge of the T-knife 10,
the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. A single-side clamping hole making method for a part with step holes on two sides is characterized by comprising the following steps of: the method mainly comprises the following steps:
step S1: the upper counter bore (3), the step bore (4) and the lower counter bore (5) are respectively roughly milled by adopting an end mill, the diameters of the step bore (4) and the lower counter bore (5) are the same, and the allowance of the side face of the upper counter bore (3) is obtained by rough milling△ 1=0.5mm, and the allowance of the side surface of the stepped hole (4)△ 2=0.5mm, process margin of sinking hole (5)△ 3=(D 4-D 3) 2+0.5, wherein 2D 1＜D 3，D 1Is the diameter of the end mill;
step S2: adopting a T-shaped cutter (10) to mill the lower counter bore (5) in a repairing way, wherein the diameter of the cutting edge of the T-shaped cutter (10) is D5The diameter of the cutter bar is D6And is andD 5＜D3，(D 5-D 6)/2＞(D 4-D 3) 2; the allowance of the side surface of the lower counter bore (5) after the milling is supplemented△ 4=0.5mm, no margin is left on the bottom surface;
step S3: respectively finely boring the upper counter bore (3) and the stepped bore (4), and after installing a boring cutter (14), determining the direction of a cutter point of a cutter head (15) of the boring cutter when the SPOS =0, and taking the direction of the cutter point as the positive direction of an X axis; then, the boring cutter (14) is inserted into the hole downwards along the Y axis to bore the hole, the machine tool stops rotating after the hole is bored, and the tool tip of the boring cutter (14) is ensured to be still directed to the positive direction of the X axis; then the boring cutter (14) retreats along the X-axis negative direction1=0.1mm, and then exits upward along the Y axis;
step S4: reversely boring the lower counter bore (5), and boring the lower counter bore (5) by using a reverse boring cutter; after the boring cutter (14) is mounted, the direction of the cutting edge of the tool bit (15) of the reverse boring cutter is determined when SPOS =0, and the direction of the cutting edge is taken as the X-axis forward direction(ii) a The main shaft stops rotating, and the reverse boring cutter (14) moves L along the negative direction of the X axis at the position of the hole axis3The distance is measured, then the boring tool rapidly extends into the hole downwards along the Y-axis direction, and the tool tip of the reverse boring tool (14) is ensured to completely extend out of the lower end face of the lower counter bore (5); the main shaft continues to stop rotating, and the reverse boring cutter (14) moves L along the positive direction of the X axis3The distance is equal to the distance, the main shaft is reversed, the reverse boring cutter (14) moves upwards to the upper end of the sinking hole (5) along the Y axis at the boring speed, and after boring the hole, the reverse boring cutter (14) moves downwards to the lower end face of the sinking hole (5) along the Y axis at the boring speed to withdraw the part; the main shaft stops rotating to ensure that the tool tip of the reverse boring and boring tool (14) points to the positive direction of the X axis and then moves in the reverse direction of the X axis by L3Distance, exit upwards along the Y-axis direction.
2. The single-side clamping hole making method for the double-side stepped hole (4) (1) part according to claim 1, characterized in that: the above-mentionedL 3=(D 4-D 3) 0.2 to 0.5, whereinD 3Is the diameter of the step hole (4);D 4is the diameter of the lower counter bore (5).
3. The single-side clamping hole making method for the double-side stepped hole part as claimed in claim 1, wherein the method comprises the following steps: in the step S3, the upper counter bore (3) and the step bore (4) are bored by adopting a digital display boring cutter (14) and a fixed boring method, and the boring width is cut each timea e ≤0.2mm。
4. The single-side clamping hole making method for the double-side stepped hole part as claimed in claim 1 or 2, wherein the method comprises the following steps: in the step S4, a digital display boring cutter (14) with a reverse boring function is adopted, and a method of fixed boring and reverse boring is adopted to bore the lower counter bore (5), wherein the bore is cut to be wide each timea e ≤0.2mm。
5. The single-side clamping hole making method for the double-side stepped-hole part as claimed in claim 4, wherein the method comprises the following steps: the tool bit of the reverse boring cutter (14) is reversely arranged, and the tool tip reaches the reverse boringThe distance between the near end side of the boring cutter (14) and the cutter barL 4>（D 4-D 3) And 2, the distance from the knife tip to the far end side of the knife barL 5<D 3-1.1。
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| CN110193703A (en) * | 2019-06-19 | 2019-09-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of high-precision processing method of connecting shaft |
| CN110421186B (en) * | 2019-08-07 | 2020-07-24 | 武汉重工铸锻有限责任公司 | Method for correcting deflection of long and thin deep hole |
| CN110695388A (en) * | 2019-10-24 | 2020-01-17 | 成都飞机工业（集团）有限责任公司 | Method for machining coaxiality hole |
| CN111633225A (en) * | 2020-05-07 | 2020-09-08 | 航天材料及工艺研究所 | Large aperture ratio eccentric boring cutter |
| CN111958012B (en) * | 2020-08-18 | 2022-07-12 | 哈尔滨电机厂有限责任公司 | Method for guaranteeing precision of shaft coupling and shaft hole boring |
| CN112935317B (en) * | 2021-01-11 | 2022-12-27 | 武汉船用机械有限责任公司 | Method for machining part with opposite annular bosses |
| CN113305517B (en) * | 2021-06-21 | 2022-10-11 | 成都爱乐达航空制造股份有限公司 | Method for processing side wall holes of ribs and flanges |
| CN113894334B (en) * | 2021-11-05 | 2023-06-30 | 四川航天长征装备制造有限公司 | Large thin-wall shell grid skin thickness error compensation processing method |
| CN114559220B (en) * | 2022-03-09 | 2024-10-11 | 陕西渭河工模具有限公司 | Machining tool and machining method for thin block type cam with stepped hole |
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| CA1082114A (en) * | 1978-01-18 | 1980-07-22 | Simon Arbesman | Disc brake pad and method of making a backing plate therefor |
| CN101537509B (en) * | 2008-03-19 | 2010-12-15 | 中煤张家口煤矿机械有限责任公司 | Method and tool for machining step deep holes |
| CN201625789U (en) * | 2010-03-26 | 2010-11-10 | 江苏扬力数控机床有限公司 | Boring tool |
| CN202877567U (en) * | 2012-10-31 | 2013-04-17 | 西南计算机有限责任公司 | Vertical machining center reversed boring cutter capable of boring stepped holes with interior small and exterior big |
| CN103028752B (en) * | 2012-11-28 | 2015-06-10 | 湖北三环锻压设备有限公司 | Processing method for phi 52H7*850 deep hinge pin keyhole at matched position of parts of different materials |
| CN105583572B (en) * | 2014-11-17 | 2018-01-16 | 昌河飞机工业（集团）有限责任公司 | The processing method that milling is walked on a kind of aluminium alloy large-diameter high-accuracy orifice ring shape slope |
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